1. Products
  2. Amplifiers
  3. Operational Amplifiers (Op Amps)
  4. Low Noise Op Amps (≤ 10nV/√Hz)
  5. AD8668


Features and Benefits

  • Offset voltage: 2.5 mV max
  • Low input bias current: 1 pA max
  • Single-supply operation: 5 V to 16 V
  • Dual-supply operation: ±2.5 V to ±8 V
  • Low noise: 8 nV/√Hz @ 10 kHz
  • Wide bandwidth: 4 MHz
  • Rail-to-rail output
  • Unity-gain stable
  • Lead-free packaging
  • Qualified for automotive applications

Product Details

The AD866x family are single supply, rail-to-rail output amplifiers with low noise performance featuring an extended operating range with supply voltages up to 16 V. They also feature low input bias currents, wide signal bandwidth, and low input voltage and current noise. For lower offset voltage, choose the AD8661/AD8662/AD8664 family. The combination of low offsets, very low input bias currents, and wide supply range make these amplifiers useful in a wide variety of cost sensitive applications normally associated with much higher priced JFET amplifiers. Systems using high impedance sensors, such as photo diodes, benefit from the combination of low input bias current, low noise, and low offset and bandwidth. The wide operating voltage range matches high performance ADCs and DACs. Audio applications and medical monitoring equipment can take advantage of the high input impedance, low voltage and current noise, wide bandwidth, and the lack of popcorn noise found in many other low input bias current amplifiers.

The AD866x family is specified over the extended industrial temperature range (−40°C to +125°C). See ordering guide for automotive models.

  • Sensor amplification
  • Reference buffers
  • Medical equipment
  • Physiological measurements
  • Signal filters and conditioning
  • Consumer audio
  • Photodiode amplification
  • ADC driver
  • Level shifting circuits

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

Tools & Simulations


LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.


Models for the following parts are available in LTspice:


Design Tools

Analog Filter Wizard

Use the Analog Filter Wizard to design low-pass, high-pass, or band-pass filters with actual op amps in minutes. As you progress through the design process, you can observe the characteristics of your filter design from ideal specifications to real world circuit behavior. Quickly evaluate the tradeoffs in op amp specifications - including gain-bandwidth, noise, and supply current – to determine the best filter design for your requirements.

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
AD8668ARUZ Material Declaration Reliability Data 14-Lead TSSOP
AD8668ARUZ-REEL Material Declaration Reliability Data 14-Lead TSSOP
AD8668ARZ Material Declaration Reliability Data 14-Lead SOIC
AD8668ARZ-REEL Material Declaration Reliability Data 14-Lead SOIC
AD8668ARZ-REEL7 Material Declaration Reliability Data 14-Lead SOIC
AD8668WARUZ-R7 Material Declaration Reliability Data 14-Lead TSSOP
AD8668WARUZ-RL Material Declaration Reliability Data 14-Lead TSSOP
Wafer Fabrication Data

PCN-PDN Information

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Sample & Buy

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Buy Now Pricing

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List Pricing

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Lead Times

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Evaluation Boards

Pricing displayed is based on 1-piece.

Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.